Still unsolved. The private key for this puzzle is an integer between 2^158 and 2^159 − 1, and whoever finds it can sweep 15.90002600 BTC from 14u4nA5sugaswb6SZgn5av2vuChdMnD9E5.
Only the address is known, so a solver has to walk the interval: multiply the secp256k1 generator by each candidate key, hash the compressed public key with SHA-256 and RIPEMD-160, and compare with the address’s hash160. On average that is 2^157 tests, about 1.83e+47. A single high-end GPU running BitCrack or keyhunt manages roughly a billion tests per second.
Try cracking #159 in your browser How solvers really attack it